Satellite-to-ground quantum key distribution
arXiv:1707.00542 · doi:10.1038/nature23655
Abstract
Quantum key distribution (QKD) uses individual light quanta in quantum superposition states to guarantee unconditional communication security between distant parties. In practice, the achievable distance for QKD has been limited to a few hundred kilometers, due to the channel loss of fibers or terrestrial free space that exponentially reduced the photon rate. Satellite-based QKD promises to establish a global-scale quantum network by exploiting the negligible photon loss and decoherence in the empty out space. Here, we develop and launch a low-Earth-orbit satellite to implement decoy-state QKD with over kHz key rate from the satellite to ground over a distance up to 1200 km, which is up to 20 orders of magnitudes more efficient than that expected using an optical fiber (with 0.2 dB/km loss) of the same length. The establishment of a reliable and efficient space-to-ground link for faithful quantum state transmission constitutes a key milestone for global-scale quantum networks.
18 pages, 4 figures
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- Identification of quantum generative circuits with parallel quantum neural network
- A Guide to Global Quantum Key Distribution Networks
- Scalable and Highly Fault-Tolerant Circular Quantum Byzantine Agreement
- Macroscopically entangled light fields: A quantum laser
- -Symmetric Quantum State Discrimination for Attack on BB84 Quantum Key Distribution
- Reduced State Embedding for Error Correction in Quantum Cryptography
- Quantum Metamaterials: Applications in quantum information science
- Quantum Secured Internet Transport
- Quantum Key Distribution: Bridging Theoretical Security Proofs, Practical Attacks, and Error Correction for Quantum-Augmented Networks
- Phase noise-immune unconditionally secured classical key distribution using doubly coupled Mach-Zehnder interferometer
- Enhanced Uplink Quantum Communication with Satellites via Downlink Channels
- Entanglement concentration protocols for GHZ-type entangled coherent state based on linear optics
- Finite-size security of QKD: comparison of three proof techniques
- Limits to the validity of gravitational redshift as a quantum-optical multimode mixer
- Enhancing Continuous Variable Quantum Teleportation using Non-Gaussian Resources
- Tailoring the down conversion emission profile via direct imaging with a camera
- Detector-Frame Quantum Limits for Heterodyne Timing in Relativistic Optical Links
- Additivity and chain rules for quantum entropies via multi-index Schatten norms
- Energy-time attack on detectors in quantum key distribution
- Spatially encoded light for Large-alphabet Quantum Key Distribution
- Spatial Mode Encoding for Quantum Key Distribution: From Hundreds to Thousands of Modes
- Nonclassicality and Bell nonlocality in atmospheric links
- Evaluation of Distimation's Real-world Performance on a Superconducting Quantum Computer
- Demonstration of a reconfigurable quantum network architecture suitable for ground-to-space communication